Determine Rule for Input Output Table

Which gives the correct output for 11 and 15?

• 15
  19
• 7
  11
• 12
  16

Which gives the correct output for 12 and 15?

• 13
  16
• 15
  18
• 9
  12
• 9
  11

Which gives the correct output for 6 and 8?

• 12
  24
• 18
  21
• 18
  24
• 24
  18

Which gives the correct output for 8 and 10?

• 24
  50
• 48
  50
• 24
  60
• 48
  60

Which gives the correct output for 40 and 35?

• 45
  40
• 35
  30
• 8
  7
• 8
  6

Which gives the correct output for 54 and 69?

• 64
  79
• 44
  59
• 44
  60

Which gives the correct output for 46 and 79?

• 50
  80
• 36
  69
• 460
  790
• 56
  89

Which gives the correct output for 6 and 10?

• 18
  30
• 6
  10
• 12
  20
• 13
  19

Which gives the correct output for 63 and 72?

• 7
  8
• 6
  7
• 7
  9
• 8
  9

What is the rule?
What numbers complete this table?

• -6
  4 and 10
• ÷2
  5 and 8
• x2
  20 and 32